[Equest-users] Campus CHW or HW loop losses (or gains !!)

[Steven Savich]

John,

 

You can input the UA into the losses tab of a circulation loop – a supply UA
and/or a return UA.  You will, of course, need to do an outside calc of your
piping UA.  You can then select where the circ loop is located (zone,
outdoor, tunnel, or underground).  Losses are calculated based on UA and DT
between the delivery temperature and environment temperature.  You can
specify a temperature or temperature schedule for tunnel.  Underground just
uses the weather file ground temp, I believe.

 

Haven’t had time to try it out, but it would be interesting to see if
chilled water consumption is decreased in an eQuest model by locating it
underground with a favorable ground temperature difference.

 

Steven

 

Steven Savich

Systems West Engineers

411 High Street

Eugene, OR  97401-2427

(541) 342-7210

(541) 342-7220 (fax)

  _____  

From: equest-users-bounces at lists.onebuilding.org
[mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Aulbach,
John
Sent: Tuesday, November 04, 2008 2:27 PM
To: equest-users at lists.onebuilding.org
Subject: [Equest-users] Campus CHW or HW loop losses (or gains !!)

 

Folks:

 

The question was put to me regarding campus chilled or hot water circulation
loop looses or gains. The person contended that he always seemed to find
campus central plants oversized because the designers were always sizing CHW
piping for losses. He contends that, in reality, the ground is actually
being cooled from the continuous flow and the normal 55°F ground temperature
that exists 8 - 15 feet below the surface is actually helping maintain the
CHW temperature.

 

Where in eQuest are we inputting the length of pipe run for such a system?

 

John R. Aulbach, PE, CEM

Project Manager

Nexant, Inc.

701 West Kimberly Ave., Suite 245

Placentia, CA 92870-6342 USA

Phone: 714-524-4402

Fax: 714-524-4407

email: jaulbach at nexant.com

 

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